And Jeff's site once again provides the answers...
H/S Inc: There seems to be little reference to the Monster Baiting arc in this issue, specifically the syringe. Is Cassie keeping secrets from Vlad (and the readers)?
Tim: Yes. This will be resolved in issue 20!
It's a bit of a wait to find out what impact the big game changer had on her but well, when I started feeling he was going the sappy romantic route with Sam and Cassie, he pleasantly surprised me by breaking away from that in a game changing way. So I'm pretty sure he'll do something really cool in #20.